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rune No. 4 - Design <br /> xhe sed-t- a-,tation and drainage control suu tunes at RLi.-..e rIo. 4 portal include <br /> the folluwing: Design details are shun on Plates 4-2 and 4-3. Pond design criteria <br /> are strin rized in calculations - paragraph 5. <br /> a.) Sedimentation Ponds Liin. F uir�d St_ oZ"a4-e <br /> 4-1 West Side 0.84 ac/ft <br /> 4-2A Fast Side <br /> 4-2B Combined <br /> 4-2C capacities of <br /> 4-2D 0.11 ac/ft <br /> b.) Collection and Diversion Ditches <br /> c.) Diversion Berms <br /> Sediur—:tatlon Pond 4-1. is an ex-i.st:ng s--'-_;ture that resist be mc,ii fled to meet <br /> ernb 'anent design critera a in acccrc��r:ce with 02M Regulations. Ybdification <br /> include increasing fill sl-opes (2:1 and 3:1) frOm e;dsti,;g 1.5:1 slopes instal- <br /> lation of an a rgency spillway and a gated outlet works. <br /> Sedinwit and r=,ofi from Drainage A.--ea 4-1 w-i 1.1 be divei-Led -LC) Prm--�d 4-1 by <br /> ditches and swales. Sediurnt and r moff i�Cm Luidisturbed areas will be collected <br /> in a s ale formed by the hi.ghk-ali and a n -wly constY-ucted earth berm at the higsl- <br /> wall toe. (see detail sheet 5-2) This runoff and sedi -.ent then will be. alicwed <br /> to cross-over the pad sedinr -t collector ditch via an 18-inch uiaaiet?r corrugated <br /> mt� pipe. Timms pipe -willcii_scnarge over aid onto the steep sloping s,�ilc <br /> Sedgy ,t and =- off from the -road above Pad 4-1 also will be conveyed t0 the <br /> inch dieter crossover pipe. <br /> D?-ai�-�age area 4-1 `,r l be fo-med by regrading the road crown at the pad eri-- <br /> trance area to peraiiit overland flows to enter 1,1011d; 4-1. <br /> Pond 4-1 is located T,ithJ',_-, a potential avalanche path as ,ell as a potential <br /> slope fail4.,re area. <br /> Four Sedize-star-Lon 'Pcnds, 4-2k, 4-2B, 4-2C, and 4-2D are prorese4 to be <br /> constricted as shown cr. Plates 4--1 and 4--2 in order to met C2i Reg.:_atiors acid <br /> w-ater quality Stul��,^2"ds. <br /> -7- <br /> ' �J <br />